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WO2018104377A1 - Nouveaux matériaux cristallins chargeables, en particulier destinés à être utilisés en tant que matériaux d'électrode dans des dispositifs de stockage électrochimiques - Google Patents

Nouveaux matériaux cristallins chargeables, en particulier destinés à être utilisés en tant que matériaux d'électrode dans des dispositifs de stockage électrochimiques Download PDF

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WO2018104377A1
WO2018104377A1 PCT/EP2017/081663 EP2017081663W WO2018104377A1 WO 2018104377 A1 WO2018104377 A1 WO 2018104377A1 EP 2017081663 W EP2017081663 W EP 2017081663W WO 2018104377 A1 WO2018104377 A1 WO 2018104377A1
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crystalline material
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crystalline
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Martin Valldor
Iryna Antonyshyn
Kwing To LAI
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Max Planck Gesellschaft zur Foerderung der Wissenschaften
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B19/00—Selenium; Tellurium; Compounds thereof
    • C01B19/002—Compounds containing, besides selenium or tellurium, more than one other element, with -O- and -OH not being considered as anions
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B19/00—Selenium; Tellurium; Compounds thereof
    • C01B19/007—Tellurides or selenides of metals
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G1/00—Methods of preparing compounds of metals not covered by subclasses C01B, C01C, C01D, or C01F, in general
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G45/00—Compounds of manganese
    • C01G45/20—Compounds containing manganese, with or without oxygen or hydrogen, and containing one or more other elements
    • C01G45/22—Compounds containing manganese, with or without oxygen or hydrogen, and containing two or more other elements
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/009—Compounds containing iron, with or without oxygen or hydrogen, and containing two or more other elements
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G51/00—Compounds of cobalt
    • C01G51/80—Compounds containing cobalt, with or without oxygen or hydrogen, and containing one or more other elements
    • C01G51/82—Compounds containing cobalt, with or without oxygen or hydrogen, and containing two or more other elements
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/30—Three-dimensional structures
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/40—Electric properties

Definitions

  • battery systems are used when it is necessary to store large amounts of energy for a long time; on the other hand, double layer capacitors are used when a given application requires high power density and cycle stability .
  • the energy is stored electrochemically in oxidation or reduction processes. In this way, today the energy density in commersially available lithium ion batteries is about 200 mAh g _1 .
  • various new electrode materials with improved properties were developed and used.
  • Lii_ x Co02 Lii_ x Co02, e.g. as disclosed in US 4,357,215.
  • EP 1367661 A2 discloses a cathode active material for lithium ion secondary batteries which is a Li-containing composite oxide comprising a plurality of transition metal elements selected from Cr, Mn, Fe, Co, Ni, and Cu, and having a monoclinic crystal structure.
  • a cathode active material including a compound of formula Li x Co y Mi- y A 2 is disclosed, wherein M is at least one selected from a specific group of metals, in particular transition metals, and A is one selected from the group consisting of 0, F, S and P.
  • M is at least one selected from a specific group of metals, in particular transition metals
  • A is one selected from the group consisting of 0, F, S and P.
  • the crystal structure of this material is disclosed to be spinel-like.
  • US 2012/0068109 Al describes a cathode material for secondary lithium batteries which is a material with composite structures formed with more than two different components selected from a general formula [Li a Mi_ y M y O b X c ) ⁇ WO 2016/131008 Al discloses crystalline materials of the formula Li3_5M5 /m BA with an anti-perovskite structure, wherein B is a divalent anion and A is a monovalent anion, but does not disclose a sum of the negative formal charges of the anions B + A which is in the range from -4 to -8, or more specifically -4 to -6.
  • Olivine structured Lii_ x FeP0 4 also represents a battery cathode material with high charge-capacity and low costs, but the charge rates are relatively low due to slow Li ion migration.
  • the reason for this problem is identified as Li-Fe inter-site mixing and the low dimensionality of Li-migration paths (ID tunnels) - Ref: J. Wang, Y. K. Chen-Wiegart and J. Wang, Nat. Commun., 2014, 5, 4570.
  • Lii_ x FeP0 4 is already applied in low energy technology, due to its environmetally friendly disposal.
  • Li x Ag 2 V 4 0n is used commercially to drive implantable cardioverter defibrillators. It is used because of its high charge/discharge rates and chemical stability .
  • a main object underlying the present invention is to provide other chargeable materials having improved properties and/or which can be produced in a simple and cost-effective manner, for use in various electrochemical storage devices on the basis of aqueous and non-aqueous systems, in particular for batteries.
  • novel crystalline material of the invention according to claim 1 is a crystalline material having the formula A3- ( x +y ) TM y DE , wherein
  • x may be in the range from 0 ⁇ 2, preferably in the range from 0 ⁇ 1.5, more specifically in the range from 0 ⁇ 1, and indicates the number of vacant lattice positions of A; x is 0 or essentially 0 in the pristine material as synthesized and becomes larger in the charged material used in a battery, y is in the range from 0 ⁇ y ⁇ 2, preferably in the range from 0.5 ⁇ y ⁇ 1.5, typically 1 or very close to 1, for example in the range from 0.9 to 1.1, such as 0.9 or 0.95 to 1, or 1 to 1.05 or 1.1,
  • the sum of the negative formal charges of D + E is in the range from -4 to -8, preferably -4 to -6,
  • the material does not contain structure-building halogen atoms or ions.
  • the anions D and E are anions, typically monoatomic anions, of elements from groups 13-16, preferably 15-16, of the periodic system, in particular selected from the group comprising B, Al, C, Si, Sn, Pb, N, P, As, Sb, Bi, Ga, Ge, In, 0, S, Se, Te, and Tl, preferably N, P, As, Sb, 0, S, Se, Te.
  • the transition metal (TM) is typically selected from the group comprising the elements having an atomic number in the range from 21-30, 39- 48, 57-80, preferably in the range from 21-30, and mixtures thereof .
  • the basic structure of the crystalline material according to the invention is typically 3-dimensional .
  • the crystalline material has an anti-perovskite structure.
  • perovskite are for example the natural mineral CaTi0 3 and cubic SrTi0 3 or hexagonal BaCr0 3 .
  • anti means that the cations are replaced by anions and the anions by cations to relate different crystal structures.
  • Typical cubic anti-perovskites are Ti 3 SbN, where Ti replaces 0, Sb replaces Sr, and N replaces Ti, compared with SrTi0 3 .
  • the crystalline material of the invention may have a cubic or pseudocubic, hexagonal, trigonal, or rhombohedral lattice structure.
  • these structures are either cubic (or pseudocubic) with unit cell parameter a in the range 3.7-4.5 A or hexagonal (any ⁇ , where n is an even number, e.g. 2H, 4H, 6H, etc. or equivalent rhombohedral settings.
  • Figure 1 illustrates typical structures: (left) The unit cell content of cubic (or average of pseudo-cubic) anti-perovskite (A-TM) 3 DE with emphasized E (A-TM) 6 octahedron. (right) An example or a 4H-hexagonal anti-perovskite with exhibited arrangement of octahedra.
  • the metal site (A + /TM n+ ) may contain a mixture of A and TM or there may be a super-structure ordering of A and TM within the D-E lattice .
  • A is Li
  • TM is selected from Fe
  • Co is selected from Mn
  • D is selected from S, Se and Te
  • E is 0.
  • a further aspect of the present invention relates to a favourable method for preparing the crystalline material as defined above.
  • said method comprises at least the following steps: a) preparing a powdery mixture of A 2 D + TME, or AD + A + TME, or A 2 E + TMD, or AE + A + TMD, or A 2 D + TM + E, or AD + A + TM
  • step b) quenching the product obtained in step b) to room temperature (typically 15-25°C, such as 20-25°C), preferably within a time period in the range from 1 s to an hour, more preferred within a range from 1 s to 5 minutes, more preferred within 1 minute, whereby a crystalline material as defined above is obtained.
  • room temperature typically 15-25°C, such as 20-25°C
  • step b) is performed in an inert gas atmosphere, such as a nitrogen or argon atmosphere, or in vacuum.
  • an inert gas atmosphere such as a nitrogen or argon atmosphere, or in vacuum.
  • the quenching may be, e.g., effected by contacting the reaction vessel with a cooling medium having a relatively high heat capacity, such as for example (ice-) water or a medium with a similar or higher heat capacity.
  • a cooling medium having a relatively high heat capacity such as for example (ice-) water or a medium with a similar or higher heat capacity.
  • the quenching step is essential to obtain a highly pure material .
  • said method is a method for preparing Li 2 FeSeO wherein
  • said mixture is heated up to a temperature in the range 730 to 770 °C at a heating rate of about 50°C h _1 for a time period in the range from 1-10 h, preferably 2-5 h or 2-3 h.
  • the resulting materials have already a purity of more than 95 % without any further purification steps. These materials are slightly air-sensitive, but can be used directly - without electrochemical treatment - as opposed to Lii_ x Co02.
  • the chargeable crystalline material according to the present invention has a broad range of favourable applications in various fields.
  • said crystalline material may be used for example as an electro-active separator material, a semi ⁇ permeable membrane, thermoelectrics , or a read/writeable data storage material.
  • said crystalline material is used as an electrode material .
  • the crystalline material according to the invention is subjected to a pre-charging step, typically in a time range from 0.5-5 h, e.g. 1-3 h or 1-2 h, before the main charging/discharging steps are performed.
  • a pre-charging step typically in a time range from 0.5-5 h, e.g. 1-3 h or 1-2 h, before the main charging/discharging steps are performed.
  • C is defined as h _1 for a complete charging sequence: 3 C means that full charge (or discharge) is reached in 20 minutes.
  • 10 cycles were performed with e.g. Li 2 FeSeO at this rate and subsequently the crystallinity was confirmed by x-ray diffraction to be still good. Further, there are no indications of phase decomposition.
  • the same rate may be used, however, a slower discharge (e.g. about 0.2 mA cm -2 ) still resulted in a rather high discharge capacity (e.g. about 70 mAh g _1 ) .
  • a slower discharge e.g. about 0.2 mA cm -2
  • a rather high discharge capacity e.g. about 70 mAh g _1
  • the crystalline material used according to the invention can be obtained as a single crystal, or as a microcrystalline (500 ym - 1 ym) or nanocrystalline (0.999 ym - 0.001 ym) material .
  • the crystalline material is ground to powder and then can, eventually in the presence of a suitable binder such as polyvinylidene difluoride (PVdF) , be cast into suitable morphologies, like bars, pellets, or foils.
  • PVdF polyvinylidene difluoride
  • the electrode material which comprises a crystalline material as described above or consists of it, is typically, eventually by adding electronically conducting auxiliary material, preferably graphite, deposited on electronically conducting substrate material, which is selected from the group of metals (e.g. aluminium, copper, titanium), alloys (e.g. steel, bronze) or electronically conducting plastics (e.g. poly(p- phenylene-vinylene) (PPV) , polyaniline (PANI), polypyrrole (PPy) , polythiophene) , and constitutes an electrode with the same.
  • the electrode may also consist only of this electrode material.
  • This electrode may be an anode or a cathode, preferably it is a cathode.
  • the electrode material can be deposited on the substrate material in the traditional way as powder, as foil with a binding agent.
  • the deposition on the substrate material takes place by direct coating using principally known methods, for example a thin layer may be deposited by either molecular-beam-epitaxy- or laser-ablation- technique .
  • the direct coating has the advantage of a very simple and extremely cost-effective production and offers, in addition, an advantage in that - due to the absence of binding and filling agents - a corresponding capacity loss of electrode material is prevented.
  • the present invention relates to an electrochemical storage device, which comprises crystalline material as defined above or the above-described electrode, in particular as the cathode.
  • This electrochemical storage device is typically a battery, in case that the electrode material has oxidable or reducible centres (metal cations such as Ti, V, Cr, Mn, Fe, Co, Ni, Cu) , in particular a rechargeable secondary battery. In a preferred embodiment, this is a prismatic battery.
  • the battery is a Li, Na, K, or Ag ion battery, particularly preferably a lithium ion battery, and the crystalline material used as electrode material according to the invention then contains exclusively or predominantly the corresponding type of cations as mobile and conducting cations .
  • the materials, according to the invention are used in non-aqueous systems (with aprotic electrolytes) .
  • TM as defined above, can represent different metals
  • the operation voltage is expected to vary with the choice of TM or of a mixtures of TMs .
  • This variance is connected to the electochemical potential pair TM n+ /TM (n+1) + .
  • Fig. 1 shows presentations of the unit cells of crystals with a cubic (left) and 4H-hexagonal (right) anti-perovskite structures .
  • Fig. 4 shows powder x-ray diffraction data of Li 2 Fe eO.
  • Fig. 5 shows x-ray diffraction data of Li 2 FeSeO before and after several cycles of charging and discharging.
  • Fig. 6 shows thermal analysis data of anti-perovskite Li 2 FeSeO.
  • Fig. 7 shows x-ray diffraction data of Li 2 FeSeO after heating under inert conditions. Scan 1 and scan 8 are measured with about 2 hours inbetween and the differences are due to minor normal-air exposure because of leaking sample holder.
  • Fig. 6 shows thermal analysis data of anti-perovskite Li 2 FeSeO.
  • Fig. 7 shows x-ray diffraction data of Li 2 FeSeO after heating under inert conditions. Scan 1 and scan 8 are measured with about 2 hours inbetween and the differences are due to minor normal-air exposure because of leaking sample holder.
  • Fig. 6 shows thermal analysis data of anti-perovskite Li 2 FeSeO.
  • Fig. 7 shows x-ray diffraction data of Li 2 FeSeO after heating under inert conditions. Scan 1 and scan 8 are measured with about 2 hours inbetween and the differences are due to minor normal
  • 8 shows TG-DTA data and x-ray diffraction data of Li 2 FeSeO after exposition to dry air and normal air, respectively; 8A: TG-DTA measurement at 30°C of Li 2 FeSeO in dry air; 8B: x-ray diffraction data of pristine Li 2 FeSeO and the same powder after 5h exposure to dry air, where scan 1 and scan 8 are measured with about 2 hours inbetween and the differences are due to minor normal-air exposure because of leaking sample holder; 8C: x-ray diffraction data of pristine Li 2 FeSeO and the same powder after 1.5 h exposure to normal air.
  • Fig. 9 shows principal steps used for assessing the crystalline material of the invention: 1 - pre-charging; 2 - charging at constant current; 3- charging at constant potential; 4 - discharging.
  • Fig. 10 shows charge/discharge curves of a Li-battery with Li 2 FeSeO as a cathode and graphite as anode in the voltage range from 1.3-2.5 V; A: at 5, 10, 20 mA; B: at 40, 60 mA
  • Fig. 11 shows charge/discharge curves of a Li-battery with Li 2 FeSeO as a cathode at 80 mA.
  • Fig. 12 shows the specific charge capacity of Li 2 FeSeO at different charge rates.
  • Fig. 13 shows shows charge/discharge curves of a Li-battery with Li 2 FeSO as a cathode and graphite as anode in the voltage range from 1.2-2.8 V; A: charge/discharge at 3 and 5 mA; B: obtained specific capacities.
  • L1 2 O was first synthesized by thermally decomposing LiOH, according to Brauer [Handbuch der Praparativen Anorganischen Chemie, pages 950 ff, Samuel Elke Verlag, 1978) :
  • LiOH > Li 2 0 + H 2 0
  • a corundum crucible or metal container e.g. Fe, Ni, Pt, Pd, or Ag
  • the container/crucible is placed in a silica tube with a glass vent that is subsequently attached to a pumping station.
  • the pump is left on during the heating procedure so that the inner pressure remains lower than 10 "4 mbar.
  • the inside pressure is sufficiently low, the LiOH is slowly heated to 400 °C during 15 h before the faster heating rate is used up to 800 °C (10 h ramping time) .
  • Alkaline-earth metal oxides can be added as simple oxides, e.g. as BeO, MgO, or CaO, or as metals.
  • powders of the general composition A 2 TMDE can be obtained through solid state reactions as outlined below .
  • the homogenized powder in placed in crucibles that are commonly made of corundum (AI 2 O3) but also several different metal containers are possible, like Ni, and nobler metals.
  • the reaction heating has to be performed under inert conditions (argon) , in vacuum, or in closed silica ampoules. The latter have to be sealed with reduced inner pressures of inert gas before use.
  • Figure 4 shows the powder x-ray diffraction data of Li2FeTeO where observations are grey and simulated pattern is superimposed with a full black line. The positions of expected Bragg intensities are marked with vertical lines. Characteristic intensities of Li2Te can be observed along with an unknown intensity, marked with *.
  • Figure 5 shows x-ray diffraction patterns using Co-radiation. (bottom) as-synthesized Li 2 FeSeO (pristine) and (top) the same batch after placing it in the polymer matrix and using it as battery on charging as discharging 10 cycles at 3C rate.
  • the crystallinity remains about the same after cycling the material in a battery during about 50 cycles at different C rates - the highest was 3C for the material shown in Figure 5.
  • the peaks are broadening somewhat after the charging/discharging treatment but only the main phase is obvious as crystalline phase.
  • the broadening might be related to the partial Li-extraction and the cation disorder resulting thereof in the presented phase, i.e. the last charging cycle was interrupted at about half-charged state.
  • Figure 6 shows the data of a thermal analysis of antiperovskite Li 2 FeSeO, as heated in argon atmosphere up to 1250 °C and cooling down to 200 °C (heating and cooling progressed at 10 °C min "1 )
  • Differential thermal analysis (DTA) data are shown with a thin line and thermo-gravimetry (TG) with a thicker line. Melting/solidifying anomalies are marked with arrows and approximate temperatures.
  • Li 2 FeSeO exhibits no obvious phase transitions up to about 1030 °C, where a normal melting transition occurs.
  • the compound solidifies close to 1000 °C. In the whole temperature range up to 1250 °C there is no obvious weight loss. This is confirmed by the powder x-ray diffraction data.
  • Figure 7 shows powder x-ray diffraction data of pristine Li 2 FeSeO compared with the powder data of a sample heated up to 1000 °C (below melting point) and 1250 °C (above melting point) ; both with first and last scans are displayed to show the decomposition in normal air. Below and above the melting, the cubic anti-perovskite Li 2 FeSeO is dominating in the sample (>95 vol%) . Only the melted and recrystallized sample (1250 °C) contains minor diffraction peaks that do not belong to the cubic phase but perhaps to tiny amounts of hexagonal FeSe, Fe3Se 4 , and Li 2 Se.
  • Figure 8A TG-DTA measurement at 30 °C of Li 2 FeSeO in dry air.
  • Figure 8B Powder x-ray diffraction data of pristine Li 2 FeSeO and the same powder exposed to dry air during 5 h. Scans 1 and 8 are shown to depict the sample deterioration during the diffraction measurements, which is done in normal air. The sample of scan 1 was exposed to normal air, by the fact that the sample holder was leaking, for a time period of about 15 minutes whereas the sample of scan 8 was exposed to normal air through a holder leak for a time period of close to 2 hours.
  • Figure 8C Powder x-ray diffraction of pristine Li 2 FeSeO and of a sample that was intentionally, fully exposed to normal air for 1.5 hours.
  • the arrows indicate the common diffraction peaks in the two compared diffraction patterns. Identified secondary phases are marked with letters.
  • Li 2 FeSeO is relatively stable in dry air, which normally contains about 21% of oxygen. During 5 h, the sample weight is fairly stable and there seems to be no phase transition (Fig. 8A) .
  • the powder x-ray diffraction data of the sample exposed to dry air (5 h) has not significantly changed its crystalline character (Fig. 8B) .
  • Fig. 8C shows the formation of the hydrate Li (OH) (3 ⁇ 40) , but no Li (OH) (as in the case of Li 2 FeSO, data not shown) , which agrees with a slow Li-leaching, as all Li is oxidized and reacts with water according: Li + 2 3 ⁇ 40 Li (OH) (3 ⁇ 40) + 1 ⁇ 2 3 ⁇ 4 . All identifiable decomposition products are environmentally compatible, i.e. non-toxic. EXAMPLE 3
  • a model system for a lithium battery using exemplary materials as defined above was built and tested as follows.
  • Aluminium and copper plates (5> ⁇ 5 cm) were used as current collectors for cathode and anode, respectively.
  • Steps of electrochemical experiments 1 - pre-charging; 2- charging at constant current; 3 - charging at constant potential; 4 - discharging.
  • Open circuit voltage was measured at the beginning, in between each charging-discharging step and at the end of cycling experiment.
  • Galvanostatic Cycling with Potential Limitation (GCPL7) method was applied for data collection.
  • Pre-charging (step 1, Fig. 9) was performed using different currents. The limiting potential was chosen based on OCV values and pre-charging experiments and it was kept for current drop to ca. 0.2C (steps 2-3, Fig. 9) .
  • Discharge was done mainly at the same current (as charge) with opposite polarity (step 4, Fig. 9) .
  • the discharge was limited to a cut ⁇ off potential to prevent battery failures by over-discharging.
  • Open circuit potential of a fully discharged battery composed of Li 2 FeSeO cathode and graphite anode is equal to -1.01 V. Pre-charging was done stepwise with increasing current from 0.1 to 3.0 mA. The voltage frame was adjusted with limitation potential 2.5 V and cut-off voltage equal to 1.3 V.
  • FIG. 10A Charge-discharge curves of Li-ion battery with Li 2 FeSeO as cathode at 5; 10; 20 mA (left) and 40; 60 mA (right)
  • Fig. 10A results of charge-discharge cycling at low (C/4, C/2 and 1C) rates are illustrated. Rates were estimated on experimental values of battery capacity from pre-charging experiments. No capacity changes were observed within the cycling at constant rate whereas with increasing rate capacity decreases smoothly.
  • the highest applied charge/discharge current is 80 mA which is close to 4C rate (Fig. 11) .
  • Figure 11 Charge-discharge curves of Li-ion battery with Li 2 FeSeO as cathode at 80 mA with final discharge step at 5 mA. After nine full cycles at 80 mA (corresponding to ⁇ 3.2 mA cm- 2 ) , a tenth cycle was performed with charge at 80 mA and discharge at 5 mA aiming to check if the battery capacity can be restored after sequence of cycling at high rates. The latter discharge cycle led to specific capacity 78 mAh g _1 which is very close to the specific capacities obtained at the beginning of cycling experiments at low rates.
  • Figure 12 shows specific capacities of Li-ion battery with Li 2 FeSeO as cathode during cycling at different rates.
  • Figure 13A shows the charge-discharge curves of Li-ion battery with Li 2 FeSO as cathode and graphite at anode at 3 and 5 mA and Figure 13B shows the obtained specific capacities.
  • the voltage frame was adjusted with limitation potential 2.8 V and cut-off voltage equal to 1.2 V.
  • the decreasing capacity on cycling is probably due to loss of liquid electrolyte, because in this experiment the plastic bag container was not completely sealed .

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Abstract

L'invention concerne un nouveau matériau cristallin de formule A3-(x+y)TMyDE, dans laquelle a = un cation choisi parmi des ions de métal alcalin ou de métal alcalino-terreux et des mélanges de ceux-ci , TM = un cation de métal de transition, D et E sont 2 anions différents, typiquement des anions monoatomiques, x peut être dans la plage allant de 0 ≤ 2, de préférence dans la plage allant de 0 ≤ 1,5, plus spécifiquement dans la plage allant de 0 ≤ 1, en particulier 0, et indique le nombre de positions de grille vacantes de A, y est dans la plage de 0 < y < 2, de préférence dans la plage 0,5 < y < 1,5, typiquement 1 ou très proche de 1, par exemple dans la plage allant de 0,9 à 1,1, telle que de 0,9 ou 0,95 à 1, ou de 1 à 1,05 ou 1,1, la somme des charges formelles négatives de D + E est dans la plage allant de -4 à -8, de préférence de -4 à -6, et à condition que le matériau ne contienne pas d'atomes ou d'ions halogènes de construction de structure. Dans certains modes de réalisation spécifiques du matériau cristallin décrit, A est Li, TM est choisi parmi Fe, Co, Mn, D est choisi parmi S, Se et Te, et E est O. Dans un mode de réalisation préféré de l'invention, le matériau cristallin a une structure anti-pérovskite. D'autres aspects de l'invention concernent une méthode favorable de préparation dudit matériau cristallin et ses utilisations, en particulier en tant que matériau d'électrode.
PCT/EP2017/081663 2016-12-07 2017-12-06 Nouveaux matériaux cristallins chargeables, en particulier destinés à être utilisés en tant que matériaux d'électrode dans des dispositifs de stockage électrochimiques Ceased WO2018104377A1 (fr)

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EP16002598.7A EP3333128A1 (fr) 2016-12-07 2016-12-07 Nouveaux matériaux cristallins chargeables, en particulier pour une utilisation comme matériaux d'électrode dans des dispositifs de stockage électrochimiques
EP16002598.7 2016-12-07

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CN113880144A (zh) * 2021-09-13 2022-01-04 武汉理工大学 一种富含Mg和阳离子空位的氧化物材料及其制备方法与应用

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